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main.go
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main.go
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package main
import (
"context"
"errors"
"fmt"
"io"
"log"
"net/http"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"github.com/hi20160616/gears"
"github.com/kkdai/youtube/v2"
ytdl "github.com/kkdai/youtube/v2/downloader"
"golang.org/x/sync/errgroup"
)
const address = ":1234"
var (
jobs = make(map[string]string)
sema = make(chan struct{}, 1)
retry = 10
dlPath = "Downloads"
ytdlExe = "ytdl"
)
func init() {
root, err := os.Getwd()
if err != nil {
log.Println(err)
}
dlPath = filepath.Join(root, dlPath)
if err = downloadYtdlExe(); err != nil {
log.Printf("%v", err)
}
}
func main() {
ctx, cancel := context.WithCancel(context.Background())
g, ctx := errgroup.WithContext(ctx)
// Web goroutine
g.Go(func() error {
defer cancel()
http.HandleFunc("/", ytdlHandler)
log.Println("Youtube Downloader running on ", address)
return http.ListenAndServe(address, nil)
})
// Download
g.Go(func() error {
defer cancel()
return treatJobs()
})
if err := g.Wait(); err != nil {
log.Printf("main: %#v", err)
}
}
func ytdlHandler(w http.ResponseWriter, r *http.Request) {
v := r.URL.Query().Get("v")
q := r.URL.Query().Get("q")
if v == "" {
http.Error(w, "Hello world!\n", http.StatusBadRequest)
} else {
id, err := youtube.ExtractVideoID(v)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
jobs[id] = q
fmt.Fprintf(w, "Download videos list: \n")
for jv, jq := range jobs {
fmt.Fprintf(w, "video id: %s, video quality: %s\n", jv, jq)
}
}
}
func treatJobs() error {
for {
for v, q := range jobs {
sema <- struct{}{}
if err := download2(v, q); err != nil {
log.Println(err)
}
<-sema
}
}
}
func download2(id string, quality string) error {
defer func() {
// cleanup()
delete(jobs, id)
}()
if err := checkFFMPEG(); err != nil {
return err
}
id, err := youtube.ExtractVideoID(id)
if err != nil {
return err
}
opt := "bestvideo[height <=? 720][ext=mp4]+bestaudio[ext=m4a]/best[height <=? 720]/best"
if strings.Contains(quality, "1080") {
opt = "bestvideo[height <=? 1080][ext=mp4]+bestaudio[ext=m4a]/best[height <=? 1080]/best"
}
exe := func() string {
if runtime.GOOS == "windows" {
return ytdlExe + ".exe"
}
return "./" + ytdlExe
}()
// https://github.com/ytdl-org/youtube-dl
cmd := &exec.Cmd{}
cmd = exec.Command(exe, "-o", filepath.Join(dlPath, "%(title)s.%(ext)s"),
"-f", opt, id)
cmd.Stdout = os.Stdout
if err := cmd.Run(); err != nil {
log.Printf("%v", err)
}
log.Printf("video: %s download done.", id)
return nil
}
// download will download youtube video by src and quality,
// src is the video id,
// quality can be hd720 or hd1080 etc., default is medium
func download(id string, quality string) error {
defer func() {
// cleanup()
delete(jobs, id)
}()
dl := ytdl.Downloader{}
// dl.Debug = true
v, err := dl.Client.GetVideo(id)
if err != nil {
log.Printf("err video: %s, %v", id, err)
retry -= 1
if retry == 0 {
return errors.New("retry many times, pass this video: " + id + ".")
}
return download(id, quality)
}
if quality == "" {
quality = "hd720"
}
vfmt := v.Formats.FindByQuality(quality)
if vfmt == nil {
if len(v.Formats) > 0 {
vfmt = &v.Formats[0]
} else {
return errors.New("cannot fetch video format on id" + id)
}
}
dl.OutputDir = dlPath
if strings.HasPrefix(vfmt.Quality, "hd") {
if err = checkFFMPEG(); err != nil {
return err
}
return dl.DownloadComposite(context.Background(), "", v, vfmt.Quality, "mp4")
}
if err = dl.Download(context.Background(), v, vfmt, ""); err != nil {
return err
}
log.Printf("video: %s download done.", id)
return nil
}
func checkFFMPEG() error {
if err := exec.Command("ffmpeg", "-version").Run(); err != nil {
return fmt.Errorf("please check ffmpegCheck is installed correctly")
}
return nil
}
func downloadFile(url, savePath string) error {
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
out, err := os.Create(savePath)
if err != nil {
return err
}
defer out.Close()
_, err = io.Copy(out, resp.Body)
return err
}
func downloadYtdlExe() error {
savePath, url := "", ""
if runtime.GOOS == "windows" {
savePath = ytdlExe + ".exe"
url = "https://yt-dl.org/latest/youtube-dl.exe"
} else {
savePath = ytdlExe
url = "https://yt-dl.org/downloads/latest/youtube-dl"
}
if !gears.Exists(savePath) {
return downloadFile(url, savePath)
}
return nil
}
// cannot work right on windows cause files on use
// func cleanup() error {
// files, err := ioutil.ReadDir(dlPath)
// if err != nil {
// return err
// }
// for _, f := range files {
// fExt := filepath.Ext(f.Name())
// if fExt == ".m4a" || fExt == ".m4v" {
// if err = os.Remove(f.Name()); err != nil {
// return err
// }
// }
// }
// return nil
// }